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2. Investment securities, Continuous Unrealized Loss Position (Details) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2016
Dec. 31, 2015
Investment securities with continuous unrealized loss position    
Less than 12 Months, Fair Value $ 8,706 $ 14,663
Less than 12 Months, Unrealized Losses 68 84
12 Months or More, Fair Value 10,811 14,758
12 Months or More, Unrealized Losses 155 210
Total, Fair Value 19,517 29,421
Total, Unrealized Losses 223 294
Mortgage-backed securities    
Investment securities with continuous unrealized loss position    
Less than 12 Months, Fair Value   7,891
Less than 12 Months, Unrealized Losses   45
12 Months or More, Fair Value   0
12 Months or More, Unrealized Losses   0
Total, Fair Value   7,891
Total, Unrealized Losses   45
U.S. Government sponsored enterprises    
Investment securities with continuous unrealized loss position    
Less than 12 Months, Fair Value 7,709 3,074
Less than 12 Months, Unrealized Losses 65 13
12 Months or More, Fair Value 10,218 10,828
12 Months or More, Unrealized Losses 153 142
Total, Fair Value 17,927 13,902
Total, Unrealized Losses 218 155
State and political subdivisions    
Investment securities with continuous unrealized loss position    
Less than 12 Months, Fair Value 0 2,198
Less than 12 Months, Unrealized Losses 0 4
12 Months or More, Fair Value 593 3,930
12 Months or More, Unrealized Losses 2 68
Total, Fair Value 593 6,128
Total, Unrealized Losses 2 72
Corporate bonds    
Investment securities with continuous unrealized loss position    
Less than 12 Months, Fair Value 997 1,500
Less than 12 Months, Unrealized Losses 3 22
12 Months or More, Fair Value 0 0
12 Months or More, Unrealized Losses 0 0
Total, Fair Value 997 1,500
Total, Unrealized Losses $ 3 $ 22